docs: def pretty_merge_constants(left_cpool, right_cpool):
      """
      sequence of tuples containing (index, left type, left pretty
      value, right type, right pretty value). If the constant pools are
      of inequal length, a value of None will be set in place of the
      type and pretty value for indexes past its end
      """
  
      lsize = len(left_cpool.consts)
      rsize = len(right_cpool.consts)
  
      index = 1
      for index in range(1, min(lsize, rsize)):
          lt, lv = left_cpool.pretty_const(index)
          rt, rv = right_cpool.pretty_const(index)
          yield (index, lt, lv, rt, rv)
  
      if lsize > rsize:
          for index in range(index, lsize):
              lt, lv = left_cpool.pretty_const(index)
              yield (index, lt, lv, None, None)
  
      elif rsize > lsize:
          for index in range(index, rsize):
              rt, rv = right_cpool.pretty_const(index)
              yield (index, None, None, rt, rv)